Process of treating detinned iron and residues.



UNITED STATES PATENT OFFICE.

CHARLES E. ACKER, F NIAG RA FALLsiiEW YORK, AssIeNoR TO TIN PRODUCTS CO PANY. A CORPORATION OF NEW YORK.

PROCESS OF TREATING'DETINNED IRON AND RESIDUES.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed October 4,1906. Serial No- 387,411.

jected to the action of chlorin, converting the tin into its chlorid. The residual mass, on account of its numerous interstices, retains a considerable percentage of the tin salt, which is usually not recovered.

According to the present process, the detinned material is washed with anhydrous l1 uid, especially a solvent for stannic chlor1 and specifically with carbontetrachlorid or anhydrous petroleum. The wash liquid, containing the dissolved chlorid and usually "some chlorin, is then run off and may be used for the treatment of other residues. After repeated use, the dissolved chlorin may beremo ved by adding metallic tin and the stannic chlorid by water, the hydrated chlorid being immiscible with the wash liquid and se iarating therefrom. The detinned,

materia may be again washed with another portlon of the anhydrousli uid containing little or no tin chlorid and 0 min. After the wash li uid is drained ofi, the portion adhering to t e residue may be removed by a current of air, the air preferably being drawn -into the treating chamber and over the ma- 7 terial by means of an exhaust pump. The

mixed air and vapor is then passed through a solvent for the vapor, preferably a hea mineral oil. The removal of the residual wash liquid may be facilitated by closingl and .exhaustlng the treating chamber and eating its contents to a temperature sufficient to evaporate the liquid; The chamber may then be opened and the current of air drawn through, as described.

7 The detinned iron resulting-from the treatment of scrap with chlorin, is usually coated in part with a very thin film of ferric chlorid. In order to remove this film and protect the surfaces from rusting upon exposure to the atmosphere, it is desirable to submerge the metal, either bfeore or after removal from the detinning chamber, in a Weak alkaline bath, for example an aqueous solution of sodium hydroxid or carbonate.

I claim:

1. The process of treating detinned iron and residues, which consists in washing the material with an anhydrous liquid capable of dissolving stannic chlorid.

2. The process of removing stan'nic chlorid from the surfaces of detinned iron and residues, which consists in washing the material with carbon tetra-chlorid.

3. The process of treating detinned iron and residues, which consists in successively washing the material with different portions of an anhydrous liquid capable of dissolving stannic chlorid.

4. The process of removing wash liquors from detinned iron and residues, which consists in draining the material, and subjecting it to a current of air.

5. The process of removing wash liquors from detinned iron and residues, which consists in draining the material, subjecting it to a current of air, and passing the mixed air and vapor through a solvent for the vapor. j

6. The process of removing wash liquors from detinned iron and residues, which consists in draining the material, subjecting it to a current of air, and passing the mixed air and vapor throu h a non-volatile oil.

7. The process 0% removing wash liquors from detinned iron and residues, which consists in draining the material, heating it, and subjecting it to a current of air.

8. The process of removing wash liquors from detinned iron and residues, which consists in draining the material, heating it in vacuo, and subjecting it to a current of air.

9. The process ofremoving wash liquors from detinned iron and residues, which con- .sists in draining the material, heating it,

subjecting it to a current of air, and passing I ames In testimony whereof, I afiix my signature in presence of two witnesses.

CHARLES E. ACKER.

the mixed air and vapor through a solvent for the vapor.

10. The process of treating detinned iron and residues, which consists in successively 5 washing the material with an anhydrous liquid capable of dissolving stannic chlorid and an alkaline solution.

Witnesses:

Or'ro J. JAooBY, v GERALDINE M, MCBRIDE. 

